(Acts 2:1) Now while the day of the Festival of Pentecost was in progress, they were all together at the same place. . .

Encompasses this ...

(Acts 1 v 13,14) 13 When they arrived, they went up into the upper room where they were staying. There were Peter as well as John and James and Andrew, Philip and Thomas, Bar·tholʹo·mew and Matthew, James the son of Al·phaeʹus, and Simon the zealous one, and Judas the son of James. 14 With one purpose all of these were persisting in prayer, together with some women and Mary the mother of Jesus and with his brothers.